Tidally Triggered Star Formation in Close Pairs of Galaxies, III: Major and Minor Interactions

Details Tidally Triggered Star Formation in Close Pairs of Galaxies, III: Major and Minor Interactions Tidally Triggered Star Formation in Close Pairs of Galaxies, III: Major and Minor Interactions

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.6021f&link_type=abstract

American Astronomical Society Meeting 205, #60.21; Bulletin of the American Astronomical Society, Vol. 36, p.1445

Astronomy and Astrophysics

Astronomy

Scientific paper

We study star formation in a sample of 281 galaxies in 139 pairs and compact groups drawn from the original CfA2 redshift survey and from our follow-up search for companions. We construct our sample with attention to including pairs with large luminosity contrast, and we find ˜ 20% of the pairs have a magnitude difference | Δ mR | ≥ 2.0. These pairs with large luminosity contrast provide a substantial set of nearby representative cases of minor interactions, a central feature of the hierarchical galaxy formation model. We examine evidence for tidally triggered star formation in the sample as a whole and in sub-samples of intrinsic and relative luminosity. The galaxies in the sample as a whole exhibit strong correlations between the equivalent width of Hα and the projected spatial and line of sight velocity separation of the pair. Although the intrinsically bright galaxies, MZw < -19.5, and the galaxies with small magnitude differences, | Δ mR | < 1.0, show strong correlations between the equivalent width of Hα and the projected spatial separation, we do not find a correlation between the equivalent width of Hα and the projected spatial separation for the low luminosity galaxies or the fainter of the pairs with large magnitude differences. We discuss the implications of our results.

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